Clutch-drum construction



Feb; 12, 1929. I 1,701,909

I accmamT" CLUTCH DHUM CONSTRUCTION Filed Nov. 15, 1926 1 N V EN TOR.

A TTORNEYS Patented Feb. 12, 1929.

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GEORGE CIGAR/HART, OF SYRAUUSE, NEW YORK, ASSIGNQR TU BROTHER-LIFE GEARCOMPANY, OF SYRACUSE, NEVJ YORK; A CGRPGRATIQN OF NE'W CLUTCH-DRUM".GQNSTR'UCTION.

Application filed November 15, 1926.

This invention relates to drum construction for multiple disk clutchesparticularly to a parti cularl y simple and efficient key and drumconstruction by which the keys, which interlook with one set of frictiondisks are firmly secured to the drum body against the development oflooseness etc.

The invention consists in the novel features and in the combinations andconstruct-ions hereinafter set forth and claimed.

In describing this invention reference is had to the accompanyingdrawings in which like characters designate corresponding parts in allthe views.

Figure 1 is an elevation, partly in section,

of an inner clutch drum embodying my invention, the contiguous portionof the clutch shaft being also shown.

Figure 2 is a fragmentary view looking to the right in Figure 1.

Figure 3 is a perspective view of one of the detached keys.

This drum construction comprises generally keys extending lengthwise ofthe periphery of the drum body and secured to the drum body on oppositesides of the medial line of the keys, the keys also having comparativelyWide bases so that the means which secure the keys to the drum body arerelieved of shearing stresses. As will be understood by those skilled inthe art, the keys of multiple disk clutches have been secured to thedrum body in many instances by rivets or other fastening means extendingalong the medial line of the key or so close thereto that the forceapplied to the keys by the disks in the normal use of the clutch exert ashearing strain on the fastening means or the rivets, which eventuallyloosens the fastening means and the keys or shears oil" the rivets. Theconstruction for eliminating the development of such looseness andeliminating the liability of the fastening means shearing off,constitutes the subject matter of this invention.

1 designates the drum body of the inner drum of a multiple disk clutch,which drum body may be of any well known form, size and construction. Itis here shown as open at one end and as having a head 2 at its other 5end, which is formed with an internal hub 3 mounted on and keyed to theclutch shaft Serial Ito. 148,385.

at 5. The drum is held on the shaft by a nut 6 screwing on the threadedreduced end 7 of the shaft against one end of a sleeve 8,

the other end'of which thrusts against the end of the hub.

9 are the keys, which extend lengthwise of the periphery of the body,that is in a direction substantially parallel to the axis of the drum,these keys being formed with key portions or ribs which enter into orinterlock with notches or grooves 10 in the disks l1 surrounding thedrum 1, and with widened base portions secured to the drum. The keys aresecured to the drum by two spaced apart or parallel rows of fasteningmeans as rivets "cured to the underlying portion of the drum by suitablefastening members as rivets 13 extending through the flanges 12 and theunderlying portion of the drum body. Preferably the keys or the baseportions thereof are seated in lengthwise grooves 14L in the drum andthe upper or outer faces of these flanges are located in arcs struckfrom the center of the drum and are flush with the periphery of thedrum. The grooves themselves are formed with flat bottoms and also thebottoms of the keys are fiat. The base portions of the keys snugly seatin the grooves.

Owing to the use of two rows of fastening means for the clutch keys andthe location of these rows on opposite sides of the key portions of thekeys, and further owing to the wide base flanges of the keys, the rivetsor fastening members are relieved of shearing stresses. In fact one setof rivets as those at the left of the key when the drive is from left toright are subjected to tension while those on the right are subjected tocompression.

That I claim is 1. A drum construction for multiple disk clutchescomprising a drum body having lengthwise grooves and a solid integralkey structure and having a laterally extending base seated in eachgroove and a projecting and a central projecting key portion, the basebeing secured to the drum onopposite sides of 10 the'key portion. 7

In testimony whereof, I have hereunto signed my name at Syracuse, in thecounty of Onondaga, and State of New York, this 13th day of November,1926. r

' GEORGE O. OARHART.

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